Compilare: user.cpp: In function ‘int main()’: user.cpp:96:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<g[i].size();j++) ^ user.cpp:116:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=1;j<g[i].size();j++){ ^ user.cpp:76:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ulei.in","r",stdin); ^ user.cpp:77:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ulei.out","w",stdout); ^ user.cpp:79:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&tests); ^ user.cpp:82:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:86:76: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&edges[i].node1,&edges[i].node2,&edges[i].color); ^