Submission #153130

#	Time	Username	Problem	Language	Result	Execution time	Memory
153130		Swan	Alternating Current (BOI18_alternating)	C++14	13 / 100	27 ms	3944 KiB

alternating

#include <bits/stdc++.h>
#define stop system("pause")
#define INP freopen("input.txt","r",stdin)
#define OUTP freopen("solve1.txt","w",stdout)
#define int long long
using namespace std;

typedef long long ll;

bool c1[1000],c2[1000];
int n,m;

void clean(int n){
    for(int i(1); i <= n;i++)c1[i] = c2[i] = 0;
}

void set_color(int x,int y,int c){
    if(x <= y ){
        for(int i(x);i<=y;i++){
            if(c == 0)c1[i] = 1;
            else c2[i] = 1;
        }
    }
    else{
        for(int i(x);i<=n;i++){
            if(c == 0)c1[i] = 1;
            else c2[i] = 1;
        }
        for(int i(1);i<=y;i++){
            if(c == 0)c1[i] = 1;
            else c2[i] = 1;
        }
    }
}

bool check(){
    for(int i(1); i <= n;i++){
        if(!c1[i] || !c2[i])return 0;
    }
    return 1;
}

main()
{
    ios_base::sync_with_stdio(0);
    cin >> n >> m;
    vector<pair<int,int> > v;
    for(int i(0); i < m;i++){
        int a,b; cin >> a >> b;
        v.push_back({a,b});
    }
    for(int mask(0); mask < (1<<m);mask++){
        clean(n);
        for(int j(0); j < m;j++){
            if(mask&(1<<j))set_color(v[j].first,v[j].second,1);
            else set_color(v[j].first,v[j].second,0);
        }
        if(check()){
            for(int j(0); j < m;j++){
                if(mask&(1<<j))cout << 0;
                else cout << 1;
            }
            return 0;
        }
    }
    cout << "impossible";
    return 0;
}
/*
*/

Compilation message (stderr)

alternating.cpp:43:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main()
      ^

• Subtask 1: 13 / 13
• Subtask 2: 0 / 20
• Subtask 3: 0 / 22
• Subtask 4: 0 / 19
• Subtask 5: 0 / 26