Envío 2346

Código

#include<stdio.h>

int main(){
    int n;
    scanf(" %d",&n);
    int nums[n];
    for(int i = 0; i < n;++i) scanf(" %d",&nums[i]);
    int sumRight = 0;
    for(int i = 0; i < n;++i)
        sumRight += nums[i];
    int last = n;
    int sumLeft = 0;
    for(int i = n-1; i > -1;--i){
        sumLeft += nums[i];
        sumRight -= nums[i];
        if(sumLeft < 0 && sumRight > 0)
            last = i;
    }
    if(last == n)
        puts("Impossible");
    else
        printf("%d\n",last);
    return 0;
}