hihocoder1148 February 29（区间闰年计数）

hihocoder1148https://hihocoder.com/problemset/problem/1148

因为题目没有给范围，我本来是这么写的。

 for(int i = ; i <= ; i++){
     if(i%==&&i%!=||i%==){
             cnt++;
     }
     memo[i] = cnt;
 }

然后RE了，事实证明长度还是很大的。

本题的关键在于利用计算闰年的方法巧妙地实现类似以上的计数。

 #include<iostream>
 #include<cstdio>
 #include<cstring>
 #include<algorithm>
 #include<cstdlib>
 #include<string>
 #include<cmath>
 #include<vector>
 #include<stack>
 #include<iterator>
 #include<queue>
 #include<cctype>
 #include<map>
 #define lson l, m, rt<<1
 #define rson m+1, r, rt<<1|1
 #define IO ios::sync_with_stdio(false);cin.tie(0);
 #define INF 0x3f3f3f3f
 #define MAXN 100010
 const int MOD=1e9+;
 typedef long long ll;
 using namespace std;
 int n, d1, d2, yy1, y2;
 char s1[], s2[];
 map<string, int> mp;
 int main()
 {
     cin >> n;
     int kase=, cnt=;
     mp["January"]=;mp["February"]=;mp["March"]=;
     mp["April"]=;mp["May"]=;mp["June"]=;
     mp["July"]=;mp["August"]=;mp["September"]=;
     mp["October"]=;mp["November"]=;mp["December"]=;
     for(int i = ; i < n; i++){
         cnt=;
         scanf("%s %d, %d", s1, &d1, &yy1);
         scanf("%s %d, %d", s2, &d2, &y2);
         if(yy1 != y2){
             //容斥的感觉
             int k1 = yy1/-yy1/+yy1/;
             int k2 = (y2-)/-(y2-)/+(y2-)/;
             cnt=k2-k1;              if(yy1%==&&yy1%!=||yy1%==){
                 if(mp[s1] <= ){
                     cnt++;
                 }
             }
             if(y2%==&&y2%!=||y2%==){
                 if(mp[s2] > ||mp[s2]==&&d2==){
                     cnt++;
                 }
             }
         }
         else{
             if(yy1%==&&yy1%!=||yy1%==){
                 if((mp[s1] <= )&&(mp[s2]>||mp[s2]==&&d2==))
                     cnt++;
             }
         }
         cout << "Case #" << ++kase << ": ";
         cout << cnt << endl;
     }
     return ;
 }