【lightoj 1183 Computing Fast Average（如此水题，竟然也会错？！）】

1183 - Computing Fast Average
Time Limit: 2 second(s) Memory Limit: 64 MB

Given an array of integers (0 indexed), you have to perform two types of queries in the array.

  1. 1 i j v - change the value of the elements from ith index to jth index to v.
  2. 2 i j - find the average value of the integers from ith index to jth index.

You can assume that initially all the values in the array are 0.

Input

Input starts with an integer T (≤ 5), denoting the number of test cases.

Each case contains two integers: n (1 ≤ n ≤ 105), q (1 ≤ q ≤ 50000), where n denotes the size of the array. Each of the next q lines will contain a query of the form:

1 i j v (0 ≤ i ≤ j < n, 0 ≤ v ≤ 10000)

2 i j (0 ≤ i ≤ j < n)

Output

For each case, print the case number first. Then for each query of the form '2 i j' print the average value of the integers from i to j. If the result is an integer, print it. Otherwise print the result in 'x/y' form, where x denotes the numerator and y denotes the denominator of the result and x and y are relatively prime.

Sample Input

Output for Sample Input

1

10 6

1 0 6 6

2 0 1

1 1 1 2

2 0 5

1 0 3 7

2 0 1

Case 1:

6

16/3

7

Note

Dataset is huge. Use faster i/o methods.

PROBLEM SETTER: JANE ALAM JAN
 
 
先贴错误代码吧。
 
坑爹啊。。。。。这可是线段树水题啊。。
 
 
  1 // Project name : 1183 ( Computing Fast Average ) 
  2 // File name    : main.cpp
  3 // Author       : iCoding
  4 // E-mail       : honi.linux@gmail.com
  5 // Date & Time  : Thu Aug  9 15:38:43 2012
  6 
  7 
  8 #include <iostream>
  9 #include <stdio.h>
 10 #include <string>
 11 #include <cmath>
 12 #include <algorithm>
 13 using namespace std;
 14 
 15 /*************************************************************************************/
 16 /* data */
 17 
 18 #ifndef MAXN
 19 #define MAXN 100100
 20 #endif
 21 
 22 #ifndef CHANGE
 23 #define CHANGE 1
 24 #endif
 25 
 26 #ifndef QUERY
 27 #define QUERY 2
 28 #endif
 29 
 30 struct Node
 31 {
 32     int left;
 33     int right;
 34     int value;
 35 };
 36 
 37 Node iMap[MAXN*4];
 38 
 39 int n, k;
 40 
 41 /*************************************************************************************/
 42 /* procedure */
 43 
 44 void debug()
 45 {
 46     printf("--debug msg--\n");
 47 }
 48 void iCreatMap(int iStart, int iEnd, int iID)
 49 {
 50     iMap[iID].left  = iStart;
 51     iMap[iID].right = iEnd;
 52     iMap[iID].value = 1;
 53 
 54     if (iStart == iEnd)
 55     {
 56         return;
 57     }
 58     else
 59     {
 60         int iMid = (iStart + iEnd) / 2;
 61         iCreatMap(iStart, iMid, iID*2);
 62         iCreatMap(iMid+1, iEnd, iID*2+1);
 63     }
 64 }
 65 
 66 void iChangeValue(int iStart, int iEnd, int iID, int iValue)
 67 {
 68     if (iMap[iID].left == iStart && iMap[iID].right == iEnd)
 69     {
 70         iMap[iID].value = iValue;
 71     }
 72     else
 73     {
 74         if (iMap[iID].value != -1)
 75         {
 76             iMap[iID*2]  .value = iMap[iID].value;
 77             iMap[iID*2+1].value = iMap[iID].value;
 78             iMap[iID].value     = -1;
 79         }
 80         int iMid = (iMap[iID].left + iMap[iID].right) / 2;
 81         if (iMid >= iEnd)
 82         {
 83             iChangeValue(iStart,   iEnd, iID * 2,     iValue);
 84         }
 85         else if (iMid + 1 <= iStart)
 86         {
 87             iChangeValue(iStart,   iEnd, iID * 2 + 1, iValue);
 88         }
 89         else
 90         {
 91             iChangeValue(iStart,   iMid, iID * 2,     iValue);
 92             iChangeValue(iMid + 1, iEnd, iID * 2 + 1, iValue);
 93         }
 94     }
 95 }
 96 
 97 int iQuery(int iStart, int iEnd, int iID)
 98 {
 99     if (iMap[iID].value != -1)
100     {
101         return (iEnd - iStart + 1) * iMap[iID].value;
102     }
103     else
104     {
105         int iMid = (iMap[iID].left + iMap[iID].right) / 2;
106         if (iMid >= iEnd)
107         {
108             return iQuery(iStart, iEnd, iID * 2);
109         }
110         else if (iMid + 1 <= iStart)
111         {
112             return iQuery(iStart, iEnd, iID * 2 + 1);
113         }
114         else
115         {
116             return iQuery(iStart, iMid, iID * 2) + iQuery(iMid + 1, iEnd, iID * 2 + 1);
117         }
118     }
119 }
120 
121 int iGCD(int a, int b)
122 {
123     int tmp;
124     while (b)
125     {
126         tmp = a % b;
127         a   = b;
128         b   = tmp;
129     }
130     return a;
131 }
132 
133 void iShowResult(int a, int b)
134 {
135     int gcd = iGCD(a, b);
136     a /= gcd;
137     b /= gcd;
138     if (b == 1)
139     {
140         printf("%d\n", a);
141     }
142     else
143     {
144         printf("%d/%d\n", a, b);
145     }
146 }
147 /*************************************************************************************/
148 /* main */
149 int main()
150 {
151     int iT;
152     scanf("%d", &iT);
153 
154     for (int iCaseCount = 1; iCaseCount <= iT; iCaseCount++)
155     {
156         printf("Case %d:\n", iCaseCount);
157         scanf("%d%d", &n, &k);
158         iCreatMap(0, n-1, 1);
159 
160         while (k--)
161         {
162             int iInstru;
163             scanf("%d", &iInstru);
164             if (iInstru == CHANGE)
165             {
166                 int iStart;
167                 int iEnd;
168                 int iValue;
169                 scanf("%d%d%d", &iStart, &iEnd, &iValue);
170                 iChangeValue(iStart, iEnd, 1, iValue);
171             }
172             if (iInstru == QUERY)
173             {
174                 int iStart;
175                 int iEnd;
176                 scanf("%d%d", &iStart, &iEnd);
177                 int iSum = iQuery(iStart, iEnd, 1);
178 
179                 // undone
180                 //printf("%d\n", iSum);
181                 iShowResult(iSum, iEnd - iStart + 1);
182             }
183         }
184 
185     }
186     return 0;
187 }
188 
189 // end 
190 // Code by Sublime text 2
191 // iCoding@CodeLab

啊，，罪过罪过。。我把和之前做的一个题目给混淆起来了。。。这里默认初始值是0 啊。。而以前做的是1，这么不小心。。。害我还不知道哪里错了。。。又浪费了不少时间啊。。。

贴个代码，认个错吧。

  1 // Project name : 1183 ( Computing Fast Average ) 
  2 // File name    : main.cpp
  3 // Author       : iCoding
  4 // E-mail       : honi.linux@gmail.com
  5 // Date & Time  : Thu Aug  9 15:38:43 2012
  6 
  7 
  8 #include <iostream>
  9 #include <stdio.h>
 10 #include <string>
 11 #include <cmath>
 12 #include <algorithm>
 13 using namespace std;
 14 
 15 /*************************************************************************************/
 16 /* data */
 17 
 18 #ifndef MAXN
 19 #define MAXN 100100
 20 #endif
 21 
 22 #ifndef CHANGE
 23 #define CHANGE 1
 24 #endif
 25 
 26 #ifndef QUERY
 27 #define QUERY 2
 28 #endif
 29 
 30 struct Node
 31 {
 32     int left;
 33     int right;
 34     int value;
 35 };
 36 
 37 Node iMap[MAXN*4];
 38 
 39 int n, k;
 40 
 41 /*************************************************************************************/
 42 /* procedure */
 43 
 44 void debug()
 45 {
 46     printf("--debug msg--\n");
 47 }
 48 void iCreatMap(int iStart, int iEnd, int iID)
 49 {
 50     iMap[iID].left  = iStart;
 51     iMap[iID].right = iEnd;
 52     iMap[iID].value = 0;
 53 
 54     if (iStart == iEnd)
 55     {
 56         return;
 57     }
 58     else
 59     {
 60         int iMid = (iStart + iEnd) / 2;
 61         iCreatMap(iStart, iMid, iID*2);
 62         iCreatMap(iMid+1, iEnd, iID*2+1);
 63     }
 64 }
 65 
 66 void iChangeValue(int iStart, int iEnd, int iID, int iValue)
 67 {
 68     if (iMap[iID].left == iStart && iMap[iID].right == iEnd)
 69     {
 70         iMap[iID].value = iValue;
 71     }
 72     else
 73     {
 74         if (iMap[iID].value != -1)
 75         {
 76             iMap[iID*2]  .value = iMap[iID].value;
 77             iMap[iID*2+1].value = iMap[iID].value;
 78             iMap[iID].value     = -1;
 79         }
 80         int iMid = (iMap[iID].left + iMap[iID].right) / 2;
 81         if (iMid >= iEnd)
 82         {
 83             iChangeValue(iStart,   iEnd, iID * 2,     iValue);
 84         }
 85         else if (iMid + 1 <= iStart)
 86         {
 87             iChangeValue(iStart,   iEnd, iID * 2 + 1, iValue);
 88         }
 89         else
 90         {
 91             iChangeValue(iStart,   iMid, iID * 2,     iValue);
 92             iChangeValue(iMid + 1, iEnd, iID * 2 + 1, iValue);
 93         }
 94     }
 95 }
 96 
 97 int iQuery(int iStart, int iEnd, int iID)
 98 {
 99     if (iMap[iID].value != -1)
100     {
101         return (iEnd - iStart + 1) * iMap[iID].value;
102     }
103     else
104     {
105         int iMid = (iMap[iID].left + iMap[iID].right) / 2;
106         if (iMid >= iEnd)
107         {
108             return iQuery(iStart, iEnd, iID * 2);
109         }
110         else if (iMid + 1 <= iStart)
111         {
112             return iQuery(iStart, iEnd, iID * 2 + 1);
113         }
114         else
115         {
116             return iQuery(iStart, iMid, iID * 2) + iQuery(iMid + 1, iEnd, iID * 2 + 1);
117         }
118     }
119 }
120 
121 int iGCD(int a, int b)
122 {
123     int tmp;
124     while (b)
125     {
126         tmp = a % b;
127         a   = b;
128         b   = tmp;
129     }
130     return a;
131 }
132 
133 void iShowResult(int a, int b)
134 {
135     if (a % b == 0)
136     {
137         printf("%d\n", a / b);
138     }
139     else
140     {
141         int gcd = iGCD(a, b);
142         a /= gcd;
143         b /= gcd;
144         printf("%d/%d\n", a, b);
145     }
146 }
147 /*************************************************************************************/
148 /* main */
149 int main()
150 {
151     int iT;
152     scanf("%d", &iT);
153 
154     for (int iCaseCount = 1; iCaseCount <= iT; iCaseCount++)
155     {
156         printf("Case %d:\n", iCaseCount);
157         scanf("%d%d", &n, &k);
158         iCreatMap(0, n-1, 1);
159 
160         while (k--)
161         {
162             int iInstru;
163             scanf("%d", &iInstru);
164             if (iInstru == CHANGE)
165             {
166                 int iStart;
167                 int iEnd;
168                 int iValue;
169                 scanf("%d%d%d", &iStart, &iEnd, &iValue);
170                 iChangeValue(iStart, iEnd, 1, iValue);
171             }
172             if (iInstru == QUERY)
173             {
174                 int iStart;
175                 int iEnd;
176                 scanf("%d%d", &iStart, &iEnd);
177                 int iSum = iQuery(iStart, iEnd, 1);
178 
179                 // undone
180                 //printf("%d\n", iSum);
181                 iShowResult(iSum, iEnd - iStart + 1);
182             }
183         }
184 
185     }
186     return 0;
187 }
188 
189 // end 
190 // Code by Sublime text 2
191 // iCoding@CodeLab
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原文地址：https://www.cnblogs.com/ismdeep/p/2630595.html