제출 #80152

#제출 시각아이디문제언어결과실행 시간메모리
80152SherazinTeleporters (IOI08_teleporters)C++14
90 / 100
830 ms66560 KiB
#include <bits/stdc++.h> #define pii pair<int, int> #define x first #define y second using namespace std; const int N = 2e6+5; int n, m; bitset<N> chk; int sz[N], mp[N], dp[N], pos[N], comp; vector<int> V(N); int main() { scanf("%d %d", &n, &m); for(int i = 1, a, b; i <= n; i++) { scanf("%d %d", &a, &b); mp[a] = b, mp[b] = a; ++dp[a], ++dp[b]; } int ptr = 0; for(int i = 1; i < N; i++) { dp[i] += dp[i-1]; if(dp[i] != dp[i-1]) pos[ptr++] = i; } for(int i = 0; i < 2*n; i++) if(!chk[i]) { ++comp; chk[i] = true; queue<int> Q; Q.emplace(i); while(!Q.empty()) { int u = Q.front(); Q.pop(); ++sz[comp]; int v = dp[mp[pos[u]]]; if(chk[v] || v == 2*n) continue; chk[v] = true; Q.emplace(v); } } int ans = sz[1]; for(int i = 2; i <= comp; i++) V[i-2] = sz[i]; sort(V.begin(), V.end(), greater<int>()); for(int i = 0; i < comp-1 && m; i++, m--) ans += V[i] + 2; if(m) ans += 2*(m - (m & 1)) + (m & 1); printf("%d\n", ans); return 0; }

컴파일 시 표준 에러 (stderr) 메시지

teleporters.cpp: In function 'int main()':
teleporters.cpp:17:12: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
       scanf("%d %d", &n, &m);
       ~~~~~^~~~~~~~~~~~~~~~~
teleporters.cpp:19:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
             scanf("%d %d", &a, &b);
             ~~~~~^~~~~~~~~~~~~~~~~
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