Submission #26873

#	Time	Username	Problem	Language	Result	Execution time	Memory
26873		top34051	Senior Postmen (BOI14_postmen)	C++14	55 / 100	550 ms	86652 KiB

postmen

#include<bits/stdc++.h>
using namespace std;
#define maxn 500005
int n,m;
int now[maxn];
int out[maxn];
bool vis[maxn];
vector<pair<int,int> > from[maxn];
stack<pair<int,int> > st;
void dfs(int x,int last) {
    int i,y;
    if(out[x]) {
        while(!st.empty()) {
            y = st.top().first;
            printf("%d ",y);
            --out[y];
            st.pop();
            if(y==x) break;
        }
        printf("\n");
    }
    for(;now[x]<from[x].size();) {
        i = now[x]++;
        if(!vis[from[x][i].second]) {
            ++out[x];
            st.push({x,from[x][i].first});
            vis[from[x][i].second] = 1;
            dfs(from[x][i].first,x);
        }
    }
}
main() {
    int i,x,y;
    scanf("%d%d",&n,&m);
    for(i=1;i<=m;i++) {
        scanf("%d%d",&x,&y);
        from[x].push_back({y,i}); from[y].push_back({x,i});
    }
    dfs(1,0);
}

Compilation message (stderr)

postmen.cpp: In function 'void dfs(int, int)':
postmen.cpp:22:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(;now[x]<from[x].size();) {
          ~~~~~~^~~~~~~~~~~~~~~
postmen.cpp: At global scope:
postmen.cpp:32:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main() {
      ^
postmen.cpp: In function 'int main()':
postmen.cpp:34:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d",&n,&m);
     ~~~~~^~~~~~~~~~~~~~
postmen.cpp:36:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d",&x,&y);
         ~~~~~^~~~~~~~~~~~~~

• Subtask 1: 38 / 38
• Subtask 2: 17 / 17
• Subtask 3: 0 / 45