Compilare: main.cpp: In function 'void solve()': main.cpp:145:13: warning: unused variable 'valmin' [-Wunused-variable] int valmin=tosolve.top().first,nodeformin=tosolve.top().second,nodeformin2=0,valmin2=1000000000; ^~~~~~ main.cpp: In function 'void citeste(int&)': main.cpp:64:36: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buff,1,DIM,stdin); ^ main.cpp:73:36: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buff,1,DIM,stdin); ^ main.cpp: In function 'int main()': main.cpp:175:38: 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); ^