20分求助，只能AC第三个点，其他都是wa too short

propitious @ 2024-02-26 21:00:55

#include<bits/stdc++.h>
using namespace std;
map<int,map<int,int> > a;
int main()
{
    int n,m,x,i,j,k;
    cin>>n>>m;
    for(int i=1;i<=m;i++)
    {
        cin>>x>>i>>j;
        if(x==1){
            cin>>k;
            if(k==0) a[i][j]=0;
            else a[i][j]+=k;
        }
        else 
            cout<<a[i][j]<<endl;
    }
}

by chao_ti_jie @ 2024-02-26 21:10:56

for循环的i和输入的冲突了

by chao_ti_jie @ 2024-02-26 21:11:35

https://www.luogu.com.cn/paste/xt6e9ycb

by Wzl111 @ 2024-03-18 20:47:13

#include<bits/stdc++.h>
using namespace std;
int n,q;
int read(){ 
    int x=0;
    int f=1;
    char c=getchar();
    while(!isdigit(c)){
        if(c=='-'){
            f=-1;
        }
        c=getchar();
    }
    while(isdigit(c)){ 
        x=x*10+(c&15);
        c=getchar();
    }
    return x*f;
}
map<long long,long long>a[100001]; 
int main(){
    n=read();
    q=read();
    while(q--){
        int x;
        x=read();
        if(x==1){
            int i,j,k;
            i=read();
            j=read();
            k=read();
            a[i][j]=k; 
        }else{
            int i,j;
            i=read();
            j=read();
            printf("%d\n",a[i][j]);
        }
    }
    return 0;
}

by Wzl111 @ 2024-03-18 20:48:33

O(q)的复杂度