Submission #3766336

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Source Code Expand

#include<bits/stdc++.h>
#define fi first
#define se second
#ifdef CX_TEST
#define Debug printf
#else
#define Debug(...)
#endif
#define LL long long
using namespace std;
typedef pair<int, int> P;
const int maxn = 1e5 + 5;

int a[maxn], b[maxn], c[maxn], p[maxn];
LL s[maxn], d[maxn];
bool vis[maxn];
vector<int> g[maxn];

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

int ff(int x) {
    if(p[x] != x) p[x] = ff(p[x]);
    return p[x];
}

int main() {
#ifdef CX_TEST
    freopen("E:\\program--GG\\test_in.txt", "r", stdin);
#endif
    int n, m, i, j, u, v;
    scanf("%d%d", &n, &m);
    for(i = 1;i <= n; i++) {
        scanf("%d%d", &a[i], &b[i]);
        a[i] = max(a[i] - b[i], 0);
        s[i] = b[i];
        d[i] = a[i];
    }
    for(i = 0;i < m; i++) {
        scanf("%d%d", &u, &v);
        g[u].push_back(v);
        g[v].push_back(u);
    }
    for(i = 1;i <= n; i++) c[i] = i;
    for(i = 1;i <= n; i++) p[i] = i;
    sort(c + 1, c + n + 1, cmp);
    for(i = 1;i <= n; i++) {
        j = c[i];
        vis[j] = 1;
        for(auto e:g[j]) {
            if(vis[e]) {
                u = ff(j), v = ff(e);
                if(u != v) {
                    s[u] += s[v];
                    p[v] = u;
                    d[u] = min(d[u], d[v] + max(0LL, a[u] - d[v] - s[v]));
                }
            }
        }
    }
    cout << s[c[n]] + d[c[n]] << endl;
    return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:33:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d", &n, &m);
                          ^
./Main.cpp:35:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d", &a[i], &b[i]);
                                    ^
./Main.cpp:41:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d", &u, &v);
                              ^

Judge Result