Submission #44267880

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Source Code Expand

#ifdef ONPC
#define _GLIBCXX_DEBUG
#else
#pragma GCC optimize("O3")
#pragma unroll
#endif

#include <bits/stdc++.h>

using namespace std;

typedef long double ld;
typedef long long ll;

int main() {
    std::ios_base::sync_with_stdio(false);
    std::cin.tie(nullptr);
    std::cout.tie(nullptr);
    std::cout << setprecision(15) << fixed;
#ifdef ONPC
    freopen("../input.txt", "r", stdin);
#endif

    int n, m;
    cin >> n >> m;

    vector<int> used(n);

    for (int i = 0; i < m; ++i) {
        int l, r;
        cin >> l >> r;
        used[r - 1] = 1;
    }
    int cnt =0;
    int ans = -1;
    for( int i =0 ; i<n;++i) {
        if( used[i] == 0) {
            cnt++;
            ans = i;
        }
    }
    if( cnt == 1) {
        cout << ans  + 1 << "\n";
    } else {
        cout << "-1\n";
    }
    return 0;
}

Submission Info

Compile Error

./Main.cpp:5: warning: ignoring #pragma unroll  [-Wunknown-pragmas]
    5 | #pragma unroll
      | 

Judge Result