hdu 5776 抽屉定理
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sum
Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 131072/131072 K (Java/Others)
Total Submission(s): 2547 Accepted Submission(s): 973
Problem Description
Given a sequence, you’re asked whether there exists a consecutive subsequence whose sum is divisible by m. output YES, otherwise output NO
Input
The first line of the input has an integer T (1≤T≤10), which represents the number of test cases.
For each test case, there are two lines:
1.The first line contains two positive integers n, m (1≤n≤100000, 1≤m≤5000).
2.The second line contains n positive integers x (1≤x≤100) according to the sequence.
Output
Output T lines, each line print a YES or NO.
Sample Input
2
3 3
1 2 3
5 7
6 6 6 6 6
Sample Output
YES
NO
#include <iostream>#include <cstdio>#include <cstring>using namespace std;const int maxn=100000+10;int a[maxn];int b[5010];int main() { int t; cin>>t; while(t--) { memset(b,0,sizeof(b)); int n,m; cin>>n>>m; cin>>a[0]; a[0]=a[0]%m; b[b[0]]++; int flag=0; for(int i=1;i<n;i++) { cin>>a[i]; a[i]=(a[i]+a[i-1])%m; b[a[i]]++; if(a[i]==0||b[a[i]]>=2) { flag=1; } } if(flag) cout<<"YES"<<endl; else cout<<"NO"<<endl; } return 0;}
题解:首先已知:若 x % m = b 且 y % m = b,那么x可以写成x = a1 * m + b,y可以写成y = a2 * m + b,(y - x) % m = ((a2 - a1) * m) % m = 0
当模m后,余数在【0,m)之间,相当于共有m个抽屉,序号从0~m-1,放入m+1个物体,其中必定有两个物体在同一个抽屉之中,利用上述定理得,该序列能整除m
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