Submission #341167

#	Time	Username	Problem	Language	Result	Execution time	Memory
341167		beksultan04	Marriage questions (IZhO14_marriage)	C++14	22 / 100	1598 ms	6252 KiB

marriage

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define pii pair<int,int>
#define OK puts("OK");
#define NO puts("NO");
#define YES puts("YES");
#define fr first
#define sc second
#define ret return
#define scanl(a) scanf("%lld",&a);
#define scanll(a,b) scanf("%lld %lld",&a, &b);
#define scanlll(a,b,c) scanf("%lld %lld %lld",&a,&b,&c);
#define scan1(a) scanf("%d",&a);
#define scan2(a,b) scanf("%d %d",&a, &b);
#define scan3(a,b,c) scanf("%d %d %d",&a,&b,&c);
#define all(s) s.begin(),s.end()
#define allr(s) s.rbegin(),s.rend()
#define pb push_back
#define sz(v) (int)v.size()
#define endi puts("");
#define eps 1e-12
const int N = 1e5+12;
const ll INF=1e15+7;
vector <int> g[N];
int vis[N],m,n,ans,l;
bool is(){
    int i;
    for (i=1;i<=m;++i){
        if (vis[i]==0)ret 0;
    }
    ret 1;
}

set<pii> s;
void dfs(int x){
    if (is()){
        s.insert({l,x});
    }
    if (x > n)ret ;
    int i;
    for (i=0;i<g[x].size();++i){
        vis[g[x][i]]++;
        dfs(x+1);
        vis[g[x][i]]--;
    }

}

main(){
    int i,k,j;
    scan3(n,m,k)
    while (k-- ){
        int x,y;
        scan2(x,y)
        g[x].pb(y);
    }
    for (i=1;i<=n;++i){
        l=i;
        dfs(i);
    }
    cout <<s.size();

}

Compilation message (stderr)

marriage.cpp: In function 'void dfs(int)':
marriage.cpp:42:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   42 |     for (i=0;i<g[x].size();++i){
      |              ~^~~~~~~~~~~~
marriage.cpp: At global scope:
marriage.cpp:50:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   50 | main(){
      |      ^
marriage.cpp: In function 'int main()':
marriage.cpp:51:13: warning: unused variable 'j' [-Wunused-variable]
   51 |     int i,k,j;
      |             ^
marriage.cpp:16:27: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   16 | #define scan3(a,b,c) scanf("%d %d %d",&a,&b,&c);
      |                      ~~~~~^~~~~~~~~~~~~~~~~~~~~
marriage.cpp:52:5: note: in expansion of macro 'scan3'
   52 |     scan3(n,m,k)
      |     ^~~~~
marriage.cpp:15:25: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   15 | #define scan2(a,b) scanf("%d %d",&a, &b);
      |                    ~~~~~^~~~~~~~~~~~~~~~
marriage.cpp:55:9: note: in expansion of macro 'scan2'
   55 |         scan2(x,y)
      |         ^~~~~

• Subtask 1: 22 / 100