Submission #1607931

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Source Code Expand

#include <stdio.h>
#include <iostream>
#include <vector>
#include <algorithm>
#include <random>
#include <chrono>
#include <map>
#include <set>
#include <numeric>
#include <unordered_map>
#include <unordered_set>
#include <cstring>
#include <sstream>
#include <queue>

using namespace std;
using ll = unsigned long long;
using triplet = tuple<ll, ll, ll>;
using vll = vector<ll>;
using vi = vector<int>;
using vvi = vector<vi>;

int main()
{
#ifdef LOCAL_TEST
    freopen("data.txt", "r", stdin);
#endif

    int X;
    scanf("%d\n", &X);
    
    ll l = 1;
    ll r = X;
    
    while (l < r)
    {
        ll m = l + ((r - l)>>1);
        ll sum_m = (m*(m+1))>>1;
        if (sum_m == X)
        {
            l = m; break;
        }
        else if (sum_m < X)
        {
            l = m+1;
        }
        else //sum_m > X
        {
            r = m;
        }
    }
    printf("%d\n", (int)l);
    return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:30:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d\n", &X);
                      ^

Judge Result