Submission #759611

#	Time	Username	Problem	Language	Result	Execution time	Memory
759611		LucaIlie	Sum Zero (RMI20_sumzero)	C++17	Compilation error	0 ms	0 KiB

sumzero

#include <stdio.h>
#include <unordered_map>

#define MAX_N 400000
#define MAX_Q 400000
#define MAX_LOG_N 18

using namespace std;

int last0[MAX_N + 2], last[MAX_N + 2], l[MAX_Q], r[MAX_Q], ans[MAX_Q];
unordered_map <int, int> mp;

int main() {
    FILE *fin, *fout;
    int n, q, a, sp, niv, b, i;

	cin >> n;
    sp = 0;
    mp[sp] = 1;
    for ( i = 1; i <= n; i++ ) {
      	cin >> a;
        sp += a;
        if ( mp[sp] > 0 )
            last0[mp[sp]] = i;
        mp[sp] = i + 1;
    }

    cin >> q;
    for ( i = 0; i < q; i++ ) {
      	cin >> l[i] >> r[i];
        ans[i] = 0;
    }

    for ( i = 1; i <= n + 1; i++ ) {
        if ( last0[i] == 0 )
            last0[i] = n + 1;
    }

    for ( i = n; i >= 1; i-- )
        last0[i] = last0[i] < last0[i + 1] ? last0[i] : last0[i + 1];

    for ( niv = MAX_LOG_N; niv >= 0; niv-- ) {
        for ( i = 1; i <= n; i++ )
            last[i] = last0[i];
        for ( b = 1; b <= niv; b++ ) {
            for ( i = 1; i <= n; i++ )
                last[i] = last[i] + 1 > n ? n + 1 : last[last[i] + 1];
            last[n + 1] = n + 1;
        }
        for ( i = 0; i < q; i++ ) {
            if ( last[l[i]] <= r[i] ) {
                ans[i] += (1 << niv);
                l[i] = last[l[i]] + 1;
            }
        }
    }

    for ( i = 0; i < q; i++ )
      cout << ans[i] << "\n";

    return 0;
}

Compilation message (stderr)

sumzero.cpp: In function 'int main()':
sumzero.cpp:17:2: error: 'cin' was not declared in this scope
   17 |  cin >> n;
      |  ^~~
sumzero.cpp:3:1: note: 'std::cin' is defined in header '<iostream>'; did you forget to '#include <iostream>'?
    2 | #include <unordered_map>
  +++ |+#include <iostream>
    3 | 
sumzero.cpp:59:7: error: 'cout' was not declared in this scope
   59 |       cout << ans[i] << "\n";
      |       ^~~~
sumzero.cpp:59:7: note: 'std::cout' is defined in header '<iostream>'; did you forget to '#include <iostream>'?
sumzero.cpp:14:11: warning: unused variable 'fin' [-Wunused-variable]
   14 |     FILE *fin, *fout;
      |           ^~~
sumzero.cpp:14:17: warning: unused variable 'fout' [-Wunused-variable]
   14 |     FILE *fin, *fout;
      |                 ^~~~