#include <stdlib.h>
#include <stdio.h>

int main (int argc, char *argv[])
{
    int n,i,s,j;
    FILE *f = fopen (argv[1], "r");

    fscanf (f, "%d", &n);
    int * v = (int*)malloc( sizeof(int) * n );
    for (i=0; i<n; i++) fscanf (f, "%d", &v[i]);
    fclose(f);


    for(i=0; i<n; i++){
        s=0;
        for (j=i; j<n; j++){
            s+=v[j];
            if ( s==0 ) printf("%d %d\n",i,j);
        }
    }

free(v);
return 0;
}