Compilare: user.cpp: In function ‘void prim()’: user.cpp:43:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<g[1].size();i++) ^ user.cpp:55:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<g[t.y].size();i++) ^ user.cpp:64:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<sol.size();i++) ^ user.cpp: In function ‘void citire()’: user.cpp:22:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("apm.in","r",stdin); ^ user.cpp:23:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&n,&m); ^ user.cpp:27:41: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d",&q.x,&q.y,&q.c); ^ user.cpp: In function ‘void prim()’: user.cpp:62:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("apm.out","w",stdout); ^