제출 #351990

#제출 시각아이디문제언어결과실행 시간메모리
351990minoumTug of War (BOI15_tug)C++17
100 / 100
1364 ms8812 KiB
#include<bits/stdc++.h> using namespace std; typedef long long int ll; const int MAXN = 6e4; int n, k, s[MAXN], l[MAXN], r[MAXN], ss = 0, s1 = 0, dd[MAXN], ww[2]; vector <int> adj[MAXN]; //id,u bool deadh[MAXN], deadt[MAXN]; inline bool ch(){ set <pair<int,int>> deg; for(int i = 0; i < 2*n; i++){ dd[i] = (int)adj[i].size(); deg.insert({dd[i], i}); } while(!deg.empty()){ if(deg.begin()->first > 1) break; if(deg.begin()->first <= 0) return false; int t = deg.begin()->second, h = -1, v2; deg.erase(*deg.begin()); for(auto i: adj[t]) if(!deadh[i]){ h = i; v2 = ((t<n)?r[h]:l[h]); break; } s1 += (t<n?s[h]:0); deadt[t] = true; deadh[h] = true; v2 = (t<n?r[h]:l[h]); if(!deadt[v2]){ deg.erase({dd[v2],v2}); dd[v2]--; deg.insert({dd[v2], v2}); } } return true; } inline void dfs(int v){ int hh = 0, v2; while(!deadt[v]){ for(auto i: adj[v]) if(!deadh[i]){ int h = i; ww[hh] += s[h]; deadh[h] = true; deadt[v] = true; v2 = ((v<n)?r[h]:l[h]); break; } hh = 1-hh; v = v2; } return; } int main() { // ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0); // cin >> n >> k; scanf("%d",&n); scanf("%d", &k); for(int i = 0; i < 2*n; i++){ //cin >> l[i] >> r[i] >> s[i]; scanf("%d", l+i); scanf("%d", r+i); scanf("%d", s+i); l[i]--; r[i]--; r[i] += n; ss += s[i]; adj[l[i]].push_back(i); adj[r[i]].push_back(i); } // int b = (ss-k+1)/2, e = (ss+k)/2; b = max(b, 0); bool check = ch(); if(!check){ // cout << "NO" << '\n'; printf("NO"); return 0; } if(ss-(2*s1) <= k && -ss+(2*s1) <= k){ //cout << "YES" << '\n'; printf("YES"); return 0; } vector <pair<int,int>> w; for(int i = 0; i < 2*n; i++) if(!deadt[i]){ ww[0] = ww[1] = 0; dfs(i); w.push_back({ww[0],ww[1]}); } bitset <MAXN*10> bt; bt[s1] = 1; for(auto i: w) bt = (bt<<i.first) | (bt<<i.second); for(int i = 0; i < ss; i++) if(bt[i] && ss-(2*i) <= k && -ss+(2*i) <= k){ //cout << "YES" << '\n'; printf("YES"); return 0; } // cout << "NO" << '\n'; printf("NO"); return 0; }

컴파일 시 표준 에러 (stderr) 메시지

tug.cpp: In function 'int main()':
tug.cpp:56:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   56 |  scanf("%d",&n); scanf("%d", &k);
      |  ~~~~~^~~~~~~~~
tug.cpp:56:23: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   56 |  scanf("%d",&n); scanf("%d", &k);
      |                  ~~~~~^~~~~~~~~~
tug.cpp:59:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   59 |   scanf("%d", l+i); scanf("%d", r+i); scanf("%d", s+i);
      |   ~~~~~^~~~~~~~~~~
tug.cpp:59:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   59 |   scanf("%d", l+i); scanf("%d", r+i); scanf("%d", s+i);
      |                     ~~~~~^~~~~~~~~~~
tug.cpp:59:44: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   59 |   scanf("%d", l+i); scanf("%d", r+i); scanf("%d", s+i);
      |                                       ~~~~~^~~~~~~~~~~
tug.cpp:39:16: warning: 'v2' may be used uninitialized in this function [-Wmaybe-uninitialized]
   39 |  while(!deadt[v]){
      |         ~~~~~~~^
tug.cpp:38:14: note: 'v2' was declared here
   38 |  int hh = 0, v2;
      |              ^~
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