提出 #8223881

---

ソースコード 拡げる

#include<bits/stdc++.h>
#define fo(i, x, y) for(int i = x, B = y; i <= B; i ++)
#define ff(i, x, y) for(int i = x, B = y; i <  B; i ++)
#define fd(i, x, y) for(int i = x, B = y; i >= B; i --)
#define ll long long
#define pp printf
#define hh pp("\n")
using namespace std;

const int N = 1e5 + 5;

int n, m, x, y;
int a[N], b[N];
int f[N], d[N], nd[N];
int F(int x) {
	return f[x] == x ? x : (f[x] = F(f[x]));
}

#define V vector<int>
#define pb push_back
#define si size()
V e[N];

int cmp(int x, int y) {
	return a[x] < a[y];
}

ll sumb[N], g[N];

int main() {
	scanf("%d %d", &n, &m);
	fo(i, 1, n) scanf("%d %d", &a[i], &b[i]), a[i] = max(0, a[i] - b[i]);
	fo(i, 1, m) {
		scanf("%d %d", &x, &y);
		e[x].pb(y); e[y].pb(x);
	}
	fo(i, 1, n) f[i] = i, sumb[i] = b[i], g[i] = a[i];
	fo(i, 1, n) d[i] = i;
	sort(d + 1, d + n + 1, cmp);
	fo(i, 1, n) nd[d[i]] = i;
	fo(i, 1, n) {
		int x = d[i];
		ff(j, 0, e[x].si) {
			int y = e[x][j];
			if(nd[y] > nd[x]) continue;
			if(F(x) != F(y)) {
				int u = f[x], v = f[y];
				f[v] = u;
				sumb[u] += sumb[v];
				g[u] = min(g[u], max(g[v], a[u] - sumb[v]));
			} 
		}
	}
	int x = F(d[n]);
	pp("%lld\n", g[x] + sumb[x]);
}

提出情報

コンパイルエラー

./Main.cpp: In function ‘int main()’:
./Main.cpp:31:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d", &n, &m);
                        ^
./Main.cpp:32:70: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  fo(i, 1, n) scanf("%d %d", &a[i], &b[i]), a[i] = max(0, a[i] - b[i]);
                                                                      ^
./Main.cpp:34:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d", &x, &y);
                         ^

ジャッジ結果