Submission #238765

#	Time	Username	Problem	Language	Result	Execution time	Memory
238765		Dynamic_Cast	Lasers (NOI19_lasers)	C++14	0 / 100	1092 ms	2296 KiB

lasers

//#include <bits/stdc++.h> C++11
#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <cmath>
#include <stdio.h>
#include <time.h>
#include <iomanip>
#include <stdlib.h>
#include <list>
#include <stack>
#include <queue>
#include <climits>
#include <map>
#include <set>
#include <sstream>
using namespace std;
typedef long long ll;
typedef pair<int, int> pi;
typedef vector<int> vi;
#define PB push_back
#define MP make_pair
int main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);
    int L,R,X,temp;
    cin>>L>>R;
    vi append;
    vector<vi> wall;
    int f,maxx;
    int flag=1;
    for(int i=0;i<R;i++){
        cin>>X;
        if(X>1){
            flag=0;
        }
        for(int j=0;j<X;j++){
            cin>>temp;
            append.PB(temp);    
        }
        wall.PB(append);
        if(X>0){
            append.clear();
        }
    }
    if (flag == 1)
    {
        cout << max(2 * maxx - L, 0) << "\n";
    }
    if(flag==0){
        int count=0;
        for (int i = 0; i < R; i++)
        {
            for (int j = 1; j < int(wall[i].size()); j++)
            {
                wall[i][j]+=wall[i][j-1];
                //cout<<wall[i][j]<<"\n";
            }
        }
        int f2=0;
        for(int i=0;i<L;i++){
            f = 0;
            for (int j = 0; j < R; j++)
            {
                f2=0;
                if ((wall[j][int(wall[j].size()) - 1]) < L - i)
                {
                    f2 = 1;
                    continue;
                }
                for (int k = 0; k < int(wall[j].size()); k++)
                {
                    if (wall[j][k] <= i && (wall[j][int(wall[j].size()) - 1] - wall[j][k]) < L-i)
                    {
                        f2=1;
                        break;
                    }
                }
                if (f2 == 0)
                {
                    f = 1;
                    count++;
                    //cout<<"laser "<<i<<" cant pass through row "<<j<<"\n";
                    break;
                }
            }
        }
        cout<<count<<"\n";
    }

    
}

Compilation message (stderr)

lasers.cpp: In function 'int main()':
lasers.cpp:32:9: warning: variable 'f' set but not used [-Wunused-but-set-variable]
     int f,maxx;
         ^
lasers.cpp:50:23: warning: 'maxx' may be used uninitialized in this function [-Wmaybe-uninitialized]
         cout << max(2 * maxx - L, 0) << "\n";
                     ~~^~~~~~

• Subtask 1: 0 / 10
• Subtask 2: 0 / 14
• Subtask 3: 0 / 20
• Subtask 4: 0 / 21
• Subtask 5: 0 / 22
• Subtask 6: 0 / 13