Submission #739147

#	Time	Username	Problem	Language	Result	Execution time	Memory
739147		nguyentunglam	Street Lamps (APIO19_street_lamps)	C++17	20 / 100	2 ms	468 KiB

street_lamps

#include<bits/stdc++.h>
#define fi first
#define se second
#define endl "\n"
#define ii pair<int, int>
using namespace std;
bool a[110][110];
int main() {
    #define task ""
    cin.tie(0) -> sync_with_stdio(0);
    if (fopen ("task.inp", "r")) {
        freopen ("task.inp", "r", stdin);
        freopen ("task.ans", "w", stdout);
    }
    if (fopen (task".inp", "r")) {
        freopen (task".inp", "r", stdin);
        freopen (task".out", "w", stdout);
    }
    int n, q; cin >> n >> q;
    string s; cin >> s; s = " " + s;
    for(int i = 1; i <= n; i++) a[0][i] = s[i] - '0';
    for(int timer = 1; timer <= q; timer++) {
        for(int i = 1; i <= n; i++) a[timer][i] = a[timer - 1][i];
        string ask; cin >> ask;
        if (ask[0] == 't') {
            int i; cin >> i;
            a[timer][i] ^= 1;
        }
        else {
            int l, r; cin >> l >> r; r--;
            int ans = 0;
            for(int j = 0; j < timer; j++) {
                bool ok = 1;
                for(int k = l; k <= r; k++) ok &= a[j][k];
                ans += ok;
            }
            cout << ans << endl;
        }
    }
}

Compilation message (stderr)

street_lamps.cpp: In function 'int main()':
street_lamps.cpp:12:17: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   12 |         freopen ("task.inp", "r", stdin);
      |         ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
street_lamps.cpp:13:17: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   13 |         freopen ("task.ans", "w", stdout);
      |         ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
street_lamps.cpp:16:17: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   16 |         freopen (task".inp", "r", stdin);
      |         ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
street_lamps.cpp:17:17: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   17 |         freopen (task".out", "w", stdout);
      |         ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 20 / 20
• Subtask 2: 0 / 20
• Subtask 3: 0 / 20
• Subtask 4: 0 / 20
• Subtask 5: 0 / 20