Submission #1833879
Source Code Expand
#include <algorithm> #include <climits> #include <cstdio> #include <cstdlib> #include <iostream> #include <vector> #define rep(i,n) for(int (i)=0;(i)<(ll)(n);++(i)) typedef vector<int> vertex; typedef vector<vertex> graph; ll n, m; graph g; void add_edge(int a, int b){ g[a].push_back(b); g[b].push_back(a); } int used[100000]; ll cnt(ll u, ll d, bool &tr){ if(used[u]){ if(used[u]!=2-d) tr = true; return 0; } used[u] = 2-d; ll res = 0; if(d==0) res++; for(int v: g[u]){ res += cnt(v, !d, tr); } return res; } int main(){ cin>>n>>m; g = graph(n); rep(i, m){ int a, b; cin>>a>>b; a--; b--; add_edge(a, b); } bool tr = false; ll t = cnt(0, 0, tr); if(tr) cout<<n*(n-1)/2-m<<endl; else cout<<t*(n-t)-m<<endl; return 0; }
Submission Info
Submission Time | |
---|---|
Task | C - 3 Steps |
User | Lepton |
Language | C++14 (GCC 5.4.1) |
Score | 0 |
Code Size | 812 Byte |
Status | CE |
Compile Error
./Main.cpp:9:9: error: ‘vector’ does not name a type typedef vector<int> vertex; ^ ./Main.cpp:10:9: error: ‘vector’ does not name a type typedef vector<vertex> graph; ^ ./Main.cpp:12:1: error: ‘ll’ does not name a type ll n, m; ^ ./Main.cpp:13:1: error: ‘graph’ does not name a type graph g; ^ ./Main.cpp: In function ‘void add_edge(int, int)’: ./Main.cpp:16:2: error: ‘g’ was not declared in this scope g[a].push_back(b); ^ ./Main.cpp: At global scope: ./Main.cpp:22:1: error: ‘ll’ does not name a type ll cnt(ll u, ll d, bool &tr){ ^ ./Main.cpp: In function ‘int main()’: ./Main.cpp:37:2: error: ‘cin’ was not declared in this scope cin>>n>>m; ^ ./Main.cpp:37:2: note: suggested alternative: In file included from ./Main.cpp:5:0: /usr/include/c++/5/iostream:60:18: note: ‘std::cin’ extern istream cin; /// Linked to standard input ^ ./Main.cpp:37:7: error: ‘n’ was not declared in this scope cin>>n>>m; ^ ./Main.cpp:37:10: error: ‘m’ was not decla...