Submission #55433

#	Time	Username	Problem	Language	Result	Execution time	Memory
55433		Diuven	Toilets (JOI16_toilets)	C++11	36 / 100	5 ms	896 KiB

toilets

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
const int MX=200010, inf=2e9;

ll n;
int m;

void NOPE(){
    cout<<-1;
    exit(0);
}

int main(){
    ios::sync_with_stdio(0); cin.tie(0);
    cin>>n>>m;


    ll mcnt=0, mn=0, mtmp=0, sum=0;

    char S[MX]; int k;
    for(int i=1; i<=m; i++){
        cin>>(S+1)>>k;

        ll now=0, low=0, cnt=0, tmp=0;
        for(int i=1; S[i]!=0; i++){
            if(S[i]=='M'){
                cnt++;
                now++;
            }
            else{
                now--;
            }
            if(low>=now) low=now, tmp=cnt;
        }

        if(now>0){
            ll gmin=sum+low;
            if(mn>=gmin){
                mn=gmin;
                mtmp=mcnt+tmp;
            }
        }
        else{
            ll gmin=sum+now*(k-1)+low;
            if(mn>=gmin){
                mn=gmin;
                mtmp=mcnt+cnt*(k-1)+tmp;
            }
        }
        sum+=now*k;
        mcnt+=cnt*k;
        
        // cout<<now<<' '<<low<<' '<<cnt<<' '<<tmp<<'\n';
    }

    if(n<mcnt) NOPE();

    ll need=max(0LL, sum-1-mn);
    cout<<need;


    return 0;
}

Compilation message (stderr)

toilets.cpp: In function 'int main()':
toilets.cpp:20:22: warning: variable 'mtmp' set but not used [-Wunused-but-set-variable]
     ll mcnt=0, mn=0, mtmp=0, sum=0;
                      ^~~~

• Subtask 1: 14 / 14
• Subtask 2: 22 / 22
• Subtask 3: 0 / 64