Compilare: main.cpp: In function 'void solve()': main.cpp:75:13: warning: unused variable 'valmin' [-Wunused-variable] int valmin=tosolve.top().first,nodeformin=tosolve.top().second,nodeformin2=0,valmin2=1000000000; ^~~~~~ main.cpp: In function 'void citire()': main.cpp:19:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("conexidad.in","r",stdin); ^ main.cpp:20:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("conexidad.out","w",stdout); ^ main.cpp:21:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ main.cpp:25:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&a,&b); ^