简直无法理解，最后一个点TLE，明明开long long了

Li_mz__ @ 2022-09-16 21:46:44

#include <bits/stdc++.h>

using namespace std;
int main(){
    string s1,s2;
    long long x[1005] = {0},y[1005] = {0},sum[2005] = {0};
    cin>>s1>>s2;
    long long l1 = s1.length();
    long long l2 = s2.length();
    for(long long i = 0;i < l1;i++){
        x[l1 - 1 - i] = s1[i] - '0';
    }
    for(long long i = 0;i < l2;i++){
        y[l2 - 1 - i] = s2[i] - '0';
    }
    for(long long i = 0;i < l1;i++){
        for(long long j = 0;j < l2;j++){
            sum[i + j] += x[i] * y[j];
            sum[i + j + 1] += sum[i + j] / 10;
            sum[i + j] %= 10;
        }
    }
    long long l = l1 + l2;
    while(sum[l] == 0 && l != 0){
        l--;
    }
    for(long long i = l;i >= 0;i--){
        cout<<sum[i];
    }
    return 0;
}

by Li_mz__ @ 2022-09-17 21:32:39

@scp020

#include <bits/stdc++.h>

using namespace std;
int main(){
    string s1,s2;
    long long x[2005] = {0},y[2005] = {0},sum[4005] = {0};
    cin>>s1>>s2;
    int l1 = s1.length();
    int l2 = s2.length();
    for(int i = 0;i < l1;i++){
        x[l1 - 1 - i] = s1[i] - '0';
    }
    for(int i = 0;i < l2;i++){
        y[l2 - 1 - i] = s2[i] - '0';
    }
    for(int i = 0;i < l1;i++){
        for(int j = 0;j < l2;j++){
            sum[i + j] += x[i] * y[j];
            sum[i + j + 1] += sum[i + j] / 10;
            sum[i + j] %= 10;
        }
    }
    int l = l1 + l2;
    while(sum[l] == 0 && l != 0){
        l--;
    }
    for(int i = l;i >= 0;i--){
        cout<<sum[i];
    }
    return 0;
}

过了

数组开小的问题

谢（屑）

by scp020 @ 2022-09-17 21:34:11

@Li_mz__ 就是野指针

by Li_mz__ @ 2022-09-17 21:35:17

@scp020 谢谢（我可真屑，学了指针还忘了）

by scp020 @ 2022-09-17 21:36:04

@Li_mz__ 你可以把它理解为你访问到了一个没有用的地址，那里面不一定装了什么

by Li_mz__ @ 2022-09-17 21:37:32

@scp020 哦哦，谢谢

快溜，有大佬