제출 #211998

#제출 시각아이디문제언어결과실행 시간메모리
211998sealnot123조이터에서 친구를 만드는건 재밌어 (JOI20_joitter2)C++14
0 / 100
14 ms19072 KiB
#include<bits/stdc++.h> #define x first #define y second #define pb push_back #define eb emplace_back #define all(a) (a).begin(),(a).end() #define SZ(a) (int)(a).size() using namespace std; typedef pair<int,int> PII; typedef long long LL; typedef double DD; typedef long double LD; typedef pair<LL,LL> PLL; typedef pair<DD,DD> PDD; typedef vector<int> VI; typedef vector<LL> VL; const int N=100007; LL ans = 0; multiset<int> I[N], O[N]; multiset<int>::iterator it, it2; set< PII > II[N], OO[N]; set< PII >::iterator iit, iit2; int p[N], s[N]; int fin(int a){ if(a == p[a]) return a; return p[a] = fin(p[a]); } set<int> wait; LL val(int a){ return (LL)s[a]*(s[a]-1) + (LL)SZ(I[a])*s[a]; } void merge(int a, int b){ /*printf("(%d,%d)\n",a,b);*/ ans -= val(a)+val(b); /*printf("asdfdas %d\n",ans);*/ I[a].erase(b); O[a].erase(b); I[b].erase(a); O[b].erase(a); if(SZ(I[a])+SZ(O[a])+SZ(II[a]) < SZ(I[b])+SZ(O[b])+SZ(OO[a])) swap(a,b); int i,j; for(it = I[b].begin(); it != I[b].end(); it++){ it2 = O[a].find(*it); if(it2 != O[a].end()) wait.insert(*it); O[*it].insert(a); I[a].insert(*it); } for(it = I[b].begin(); it != I[b].end(); it++) O[*it].erase(b); for(it = O[b].begin(); it != O[b].end(); it++){ it2 = I[a].find(*it); if(it2 != I[a].end()) wait.insert(*it); I[*it].insert(a); O[a].insert(*it); } for(it = O[b].begin(); it != O[b].end(); it++) I[*it].erase(b); for(PII e : II[b]){ if(e.y == a){ iit = OO[a].find(PII(e.x, b)); OO[a].erase(iit); continue; } OO[e.y].insert(PII(e.x, a)); iit = OO[e.y].find(PII(e.x, b)); OO[e.y].erase(iit); II[a].insert(e); } //printf("jazco\n"); for(PII e : OO[b]){ if(e.y == a){ iit = II[a].find(PII(e.x, b)); II[a].erase(iit); continue; } II[e.y].insert(PII(e.x, a)); iit = II[e.y].find(PII(e.x, b)); II[e.y].erase(iit); OO[a].insert(e); } I[b].clear(); O[b].clear(); II[b].clear(); OO[b].clear(); /*printf("result %d(%d) :\n",a,s[a]+s[b]); printf("in : "); for(int e : I[a]) printf("%d ",e); printf("\nout : "); for(int e : O[a]) printf("%d ",e); printf("\n");*/ p[b] = a; s[a] += s[b]; ans += val(a); if(wait.empty()) return; int x = *wait.begin(); wait.erase(wait.begin()); merge(a, x); } int main(){ int i,j,k,l,a,b,c,d; int n, m; scanf("%d%d",&n,&m); for(i=1;i<=n;i++){ s[i] = 1; p[i] = i; } while(m--){ scanf("%d%d",&a,&b); c = a; a = fin(a); b = fin(b); if(a != b && OO[a].find(PII(c, b)) == OO[a].end()){ it = I[a].find(b); if(it != I[a].end()){ /*printf("must merge\n");*/ merge(a, b); }else{ O[a].insert(b); I[b].insert(a); OO[a].insert(PII(c, b)); II[b].insert(PII(c, a)); ans += s[b]; } } /*printf("XXXXXXXXXXXXXXXXXXXx");*/ printf("%lld\n",ans); } return 0; } /* 4 6 1 2 2 3 3 2 1 3 3 4 4 3 6 10 1 2 2 3 3 4 4 5 5 6 6 5 5 4 4 3 3 2 2 1 */

컴파일 시 표준 에러 (stderr) 메시지

joitter2.cpp: In function 'void merge(int, int)':
joitter2.cpp:46:6: warning: unused variable 'i' [-Wunused-variable]
  int i,j;
      ^
joitter2.cpp:46:8: warning: unused variable 'j' [-Wunused-variable]
  int i,j;
        ^
joitter2.cpp: In function 'int main()':
joitter2.cpp:107:8: warning: unused variable 'j' [-Wunused-variable]
  int i,j,k,l,a,b,c,d;
        ^
joitter2.cpp:107:10: warning: unused variable 'k' [-Wunused-variable]
  int i,j,k,l,a,b,c,d;
          ^
joitter2.cpp:107:12: warning: unused variable 'l' [-Wunused-variable]
  int i,j,k,l,a,b,c,d;
            ^
joitter2.cpp:107:20: warning: unused variable 'd' [-Wunused-variable]
  int i,j,k,l,a,b,c,d;
                    ^
joitter2.cpp:109:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d",&n,&m);
  ~~~~~^~~~~~~~~~~~~~
joitter2.cpp:115:8: 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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