Submission #1677849

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Source Code Expand

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

typedef long long LL;
typedef pair<int, int> pii;

#define fst first
#define snd second
#define pb push_back
#define REP(i, a, b)  for(int i = (a), i##end = (b); i < i##end; ++i)
#define DREP(i, a, b) for(int i=(a-1), i##end = (b); i >=i##end; --i)

template <typename T> bool chkmax(T& a, T b) { return a < b ? a = b, 1 : 0; }
template <typename T> bool chkmin(T& a, T b) { return a > b ? a = b, 1 : 0; }

const int N = 400;
const int M = 100000;
const int oo = 0x3f3f3f3f;

template<typename T> T read() {
    T n(0), f(1);
    char ch = getchar();
    for( ;!isdigit(ch); ch = getchar()) if(ch == '-') f = -1;
    for( ; isdigit(ch); ch = getchar()) n = n * 10 + ch - 48; 
    return n * f;
}

int n, m;
bool ban[N + 5];
int x[M + 5], y[M + 5];
bitset <N + 5> f[N + 5];

int main() {
#ifdef Wearry
    freopen("data.txt", "r", stdin);
    freopen("ans.txt", "w", stdout);
#endif

    scanf("%d%d", &n, &m);
    for(int i = 1; i <= n; ++i) f[i][i] = true;
    for(int i = 1; i <= m; ++i) {
        scanf("%d%d", x + i, y + i);
    }

    for(int i = m; i >= 1; --i) {
        for(int j = 1; j <= n; ++j) {
            if(f[j][x[i]] && f[j][y[i]]) { ban[j] = true; continue; }
            if(f[j][x[i]]) f[j][y[i]] = true;
            if(f[j][y[i]]) f[j][x[i]] = true;
        }
    }

    int ans = 0;
    for(int i = 1; i <= n; ++i) if(!ban[i])
        for(int j = i + 1; j <= n; ++j) if(!ban[j] && (f[i] & f[j]).none()) {
            ++ ans;
        }
    printf("%d\n", ans);

    return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:39:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d", &n, &m);
                          ^
./Main.cpp:42:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d", x + i, y + i);
                                    ^

Judge Result