Submission #733038

#	Time	Username	Problem	Language	Result	Execution time	Memory
733038		boyliguanhan	Street Lamps (APIO19_street_lamps)	C++17	20 / 100	5023 ms	524288 KiB

street_lamps

#include<bits/stdc++.h>
using namespace std;
char opposite(char c) {
    if(c=='0')
        return '1';
    return '0';
}
bool ok(string str, int a, int b) {
    for(int i = a-1; i < b-1; i++) {
        if(str[i]=='0')
            return 0;
    }
    return 1;
}
int main() {
    int n, q;
    cin >> n >> q;
    vector<string> states;
    string str;
    cin >> str;
    states.push_back(str);
    for(int i = 0; i < q; i++) {
        string type;
        int a, b;
        cin >> type >> a;
        if(type=="toggle") {
            str[a-1] = opposite(str[a-1]);
        } else {
            cin >> b;
            int ans = 0;
            for(auto i: states)
                ans+=ok(i, a, b);
            cout << ans << '\n';
        }
        states.push_back(str);
    }
}

• Subtask 1: 20 / 20
• Subtask 2: 0 / 20
• Subtask 3: 0 / 20
• Subtask 4: 0 / 20
• Subtask 5: 0 / 20