Submission #1093673

#	Time	Username	Problem	Language	Result	Execution time	Memory
1093673		vjudge1	Genetics (BOI18_genetics)	C++17	100 / 100	785 ms	33360 KiB

genetics

#include<bits/stdc++.h>
using namespace std;
#define int long long
mt19937_64 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
int GetRand(int l,int r){
    return (rng()%(r-l+1))+l;
}
signed main(){
    int n,m,k;
    cin >> n >> m >> k;
    char grid[n][m];
    for(int i=0;i<n;i++){
        for(int j=0;j<m;j++){
            cin >> grid[i][j];
        }
    }
    int val[n];
    int pre[m][4];
    int sum=0;
    memset(pre,0,sizeof(pre));
    for(int i=0;i<n;i++){
        val[i]=GetRand(1,1e12);
        sum+=val[i];
    }
    for(int j=0;j<m;j++){
        for(int i=0;i<n;i++){
            if(grid[i][j]=='A'){
                pre[j][0]+=val[i];
            }
            else if(grid[i][j]=='C'){
                pre[j][1]+=val[i];
            }
            else if(grid[i][j]=='G'){
                pre[j][2]+=val[i];
            }
            else{
                pre[j][3]+=val[i];
            }
        }
    }
    for(int i=0;i<n;i++){
        int curr=0;
        for(int j=0;j<m;j++){
            curr+=sum;
            if(grid[i][j]=='A'){
                curr-=pre[j][0];
            }
            else if(grid[i][j]=='C'){
                curr-=pre[j][1];
            }
            else if(grid[i][j]=='G'){
                curr-=pre[j][2];
            }
            else{
                curr-=pre[j][3];
            }
        }
        if(curr==(sum-val[i])*k){
            cout << i+1;
            break;
        }
    }
}

• Subtask 1: 27 / 27
• Subtask 2: 19 / 19
• Subtask 3: 28 / 28
• Subtask 4: 26 / 26