Compilare: user.cpp: In function ‘void DFS(int)’: user.cpp:41:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<g[node].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:59:35: warning: narrowing conversion of ‘t’ from ‘int’ to ‘double’ inside { } [-Wnarrowing] events.push_back({t,i,x,y}); ^ user.cpp:76:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<events.size()) ^ user.cpp:111:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(k=0;k<current.size();k++) ^ user.cpp:115:54: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(k=start;k<start+current.size();k++){ ^ user.cpp:46:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("kinetic.in","r",stdin); ^ user.cpp:47:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("kinetic.out","w",stdout); ^ user.cpp:50:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:52:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&a[i],&b[i]); ^ user.cpp:56:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&x,&y,&t); ^