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Submission #230768

# Submission time Handle Problem Language Result Execution time Memory
230768 2020-05-11T16:46:52 Z nicolaalexandra Potemkin cycle (CEOI15_indcyc) C++14
80 / 100
 1000 ms 6016 KB 
#include <bits/stdc++.h>
#define DIM 1010
#define DIMBUFF 7000000
#define INF 2000000000
using namespace std;
//FILE *fin = fopen ("date.in","r");
//FILE *fout = fopen ("date.out","w");
FILE *fin = stdin;
FILE *fout = stdout;

vector <int> L[DIM];
int dist[DIM],t[DIM],a[DIM][DIM],c[DIM],sol[DIM];
pair <int,int> mch[DIM*DIM];
int n,m,x,y,i,j,k,ok,pos,el;
char buff[DIMBUFF];

int bfs (int start){

    for (int i=1;i<=n;i++){
        dist[i] = INF;
        t[i] = 0;
    }
    int p = 1, u = 0;
    c[++u] = start;
    dist[start] = 0;
    int ok = 0, val;

    while (p <= u){
        int nod = c[p];
        p++;
        for (auto vecin : L[nod]){

            if (dist[vecin] == INF && a[nod][vecin]){
                dist[vecin] = 1 + dist[nod];
                t[vecin] = nod;

                if (a[vecin][x]){
                    if (dist[vecin] > 1){
                        val = vecin;

                        while (val){
                            fprintf(fout,"%d ",val);
                            val = t[val];
                        }

                        return 1;
                    }
                } else c[++u] = vecin;
            }}}

    return 0;
}
int get_nr(){
    while(!(buff[pos] >= '0' && buff[pos] <= '9'))
        pos++;
    int nr = 0;
    while (buff[pos] >= '0' && buff[pos] <= '9'){
        nr = nr*10 + buff[pos] - '0';
        pos++;
    }
    return nr;
}
int main (){

    fread (buff,1,DIMBUFF,fin);
    //cin>>n>>m;
    n = get_nr(), m = get_nr();
    for (i=1;i<=m;++i){
        //cin>>x>>y;
        x = get_nr(), y = get_nr();
        L[x].push_back(y);
        L[y].push_back(x);
        a[x][y] = a[y][x] = 1;
        mch[i] = make_pair (x,y);
    }

    for (i=1;i<=m;i++){
        x = mch[i].first, y = mch[i].second;
        a[x][y] = a[y][x] = 0;

        if (bfs(y)){ /// am gasit un drum ok

            fprintf(fout,"%d ",x);

            return 0;
        }

        a[x][y] = a[y][x] = 1;
    }

    fprintf(fout,"no");

    return 0;
}

Compilation message

indcyc.cpp: In function 'int bfs(int)':
indcyc.cpp:26:9: warning: unused variable 'ok' [-Wunused-variable]
     int ok = 0, val;
         ^~
indcyc.cpp: In function 'int main()':
indcyc.cpp:65:11: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
     fread (buff,1,DIMBUFF,fin);
     ~~~~~~^~~~~~~~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 384 KB Output is correct
2 Correct 4 ms 384 KB Output is correct
3 Correct 5 ms 384 KB Output is correct
4 Correct 4 ms 384 KB Output is correct
5 Correct 4 ms 384 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 384 KB Output is correct

Subtask #3
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 384 KB Output is correct
2 Correct 4 ms 384 KB Output is correct

Subtask #4
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 768 KB Output is correct

Subtask #5
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 768 KB Output is correct
2 Correct 5 ms 800 KB Output is correct

Subtask #6
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 21 ms 1664 KB Output is correct
2 Correct 5 ms 1664 KB Output is correct
3 Correct 6 ms 1920 KB Output is correct
4 Correct 37 ms 1664 KB Output is correct

Subtask #7
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 1664 KB Output is correct
2 Correct 7 ms 1664 KB Output is correct

Subtask #8
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 11 ms 5632 KB Output is correct
2 Correct 31 ms 4992 KB Output is correct
3 Execution timed out 1095 ms 5632 KB Time limit exceeded
4 Halted 0 ms 0 KB -

Subtask #9
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 13 ms 4864 KB Output is correct
2 Correct 34 ms 4864 KB Output is correct

Subtask #10
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 41 ms 4608 KB Output is correct
2 Correct 210 ms 4608 KB Output is correct
3 Correct 154 ms 6016 KB Output is correct
4 Execution timed out 1097 ms 6016 KB Time limit exceeded