Submission #857024

#	Time	Username	Problem	Language	Result	Execution time	Memory
857024		chanhchuong123	Sum Zero (RMI20_sumzero)	C++14	0 / 100	6 ms	31320 KiB

sumzero

#include <bits/stdc++.h>
using namespace std;
#define task ""

const int MAX = 400040;
int n, q;
int c[MAX];
long long sf = 0;
int jump[19][MAX];
map<long long, int> last;

int main() {
	ios_base::sync_with_stdio(false); cin.tie(nullptr);

	if (fopen(task".inp", "r")) {
		freopen(task".inp", "r", stdin);
		freopen(task".out", "w", stdout);
	}

	cin >> n;
	for (int i = 1; i <= n; ++i) {
        cin >> c[i];
	}
	last[0] = n + 1;
	for (int j = 0; j <= 18; ++j) {
        for (int i = 1; i <= n + 2; ++i)
            jump[j][i] = n + 2;
	}
	for (int i = n; i >= 1; --i) {
        sf += c[i];
        jump[0][i] = min(jump[0][i], jump[0][i + 1]);
        if (last[sf] > 0) jump[0][i] = min(jump[0][i], last[sf]); last[sf] = i;
	}
	for (int j = 1; j <= 18; ++j)
        for (int i = 1; i <= n; ++i)
            jump[j][i] = jump[j - 1][jump[j - 1][i]];
    cin >> q;
    while (q--) {
        int l, r, res = 0; cin >> l >> r;
        for (int j = 18; j >= 0; --j) {
            if (jump[j][l] - 1 <= r) {
                l = jump[j][l];
                res += 1 << j;
            }
        }
        cout << res << '\n';
    }

	return 0;
}

Compilation message (stderr)

sumzero.cpp: In function 'int main()':
sumzero.cpp:32:9: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   32 |         if (last[sf] > 0) jump[0][i] = min(jump[0][i], last[sf]); last[sf] = i;
      |         ^~
sumzero.cpp:32:67: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
   32 |         if (last[sf] > 0) jump[0][i] = min(jump[0][i], last[sf]); last[sf] = i;
      |                                                                   ^~~~
sumzero.cpp:16:10: 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);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
sumzero.cpp:17:10: 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: 0 / 22
• Subtask 2: 0 / 39
• Subtask 3: 0 / 39