Submission #857057

#	Time	Username	Problem	Language	Result	Execution time	Memory
857057		chanhchuong123	Sum Zero (RMI20_sumzero)	C++14	0 / 100	4 ms	6744 KiB

sumzero

//#include <bits/stdc++.h>
//using namespace std;
//#define task ""
//
//const int MAX = 400004;
//int n, q;
//int sf = 0;
//int c[MAX];
//int to[MAX];
//int ans[MAX];
//int jump[2][MAX];
//int l[MAX], r[MAX];
//map<int, 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];
//	}
//	for (int i = 1; i <= n + 2; ++i) {
//        to[i] = n + 2;
//	}
//	last[0] = n + 1;
//	for (int i = n; i >= 1; --i) {
//        sf += c[i];
//        to[i] = min(to[i], to[i + 1]);
//        if (last[sf] > 0) to[i] = min(to[i], last[sf]); last[sf] = i;
//	}
//    cin >> q;
//    for (int i = 1; i <= q; ++i) {
//        cin >> l[i] >> r[i];
//    }
//    for (int j = 18; j >= 0; --j) {
//        for (int i = 1; i <= n + 2; ++i) {
//            jump[0][i] = to[i];
//        }
//        for (int k = 1; k <= j; ++k) {
//            int prv = (k - 1) & 1, cur = k & 1;
//            for (int i = 1; i <= n + 2; ++i) {
//                jump[cur][i] = jump[prv][jump[prv][i]];
//            }
//        }
//        for (int i = 1; i <= q; ++i) {
//            if (jump[j & 1][l[i]] - 1 <= r[i]) {
//                l[i] = jump[j & 1][l[i]];
//                ans[i] += 1 << j;
//            }
//        }
//    }
//    for (int i = 1; i <= q; ++i) {
//        cout << ans[i] << '\n';
//    }
//	return 0;
//}

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

const int MAX = 400004;
const int base = 128;
int n, q;
int c[MAX];
int pw[MAX];
int to[MAX];
int ans[MAX];
long long sf = 0;
int jump[2][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];
	}
	for (int i = 1; i <= n + 2; ++i) {
        to[i] = n + 2;
	}
	last[0] = n + 1;
	for (int i = n; i >= 1; --i) {
        sf += c[i];
        to[i] = min(to[i], to[i + 1]);
        if (last[sf] > 0) to[i] = min(to[i], last[sf]); last[sf] = i;
	}
	pw[0] = 1; pw[1] = base;
	for (int i = 1; i <= n + 2; ++i) {
        jump[0][i] = to[i];
        jump[1][i] = n + 2;
	}
	for (int j = 1; j < 2; ++j) {
        for (int i = 1; i <= n; ++i) {
            jump[j][i] = jump[j - 1][i];
            for (int k = 1; k <= base; ++k)
                jump[j][i] = jump[j - 1][jump[j][i]];
        }
	}
    cin >> q;
    while (q--) {
        int l, r, res = 0; cin >> l >> r;
        for (int j = 1; j >= 0; --j) {
            while (jump[j][l] - 1 <= r) {
                l = jump[j][l];
                res += pw[j];
            }
        }
        cout << res << '\n';
    }
	return 0;
}

Compilation message (stderr)

sumzero.cpp: In function 'int main()':
sumzero.cpp:99:9: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   99 |         if (last[sf] > 0) to[i] = min(to[i], last[sf]); last[sf] = i;
      |         ^~
sumzero.cpp:99:57: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
   99 |         if (last[sf] > 0) to[i] = min(to[i], last[sf]); last[sf] = i;
      |                                                         ^~~~
sumzero.cpp:84:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   84 |   freopen(task".inp", "r", stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
sumzero.cpp:85:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   85 |   freopen(task".out", "w", stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 22
• Subtask 2: 0 / 39
• Subtask 3: 0 / 39