Codeforces 724A. Checking the Calendar

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链接http://codeforces.com/problemset/problem/724/A
思路
开始想复杂了.

#include<bits/stdc++.h>
using namespace std;
int main(){int r[3];r[0]=31%7;r[1]=30%7;r[2]=28%7; //3  2 0char m[7][20]={"monday","tuesday","wednesday","thursday","friday","saturday","sunday"};char a[20],b[20];cin>>a>>b;int aa;int bb;for(int i=0;i<7;i++){if(strcmp(m[i],a)==0){aa=i;   }if(strcmp(m[i],b)==0){bb=i;}}int ret=(bb-aa)%7;if(ret<0)ret+=7;//printf("ret=%d\n",ret);int i;for(i=0;i<3;i++){if(ret==r[i]){printf("YES\n");break;}}   if(i==3)printf("NO\n");return 0;   }

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