Compilare: main.cpp: In function 'int main()': main.cpp:28:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(pq.size()<sol){ ~~~~~~~~~^~~~ main.cpp:31:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(pq.size()<sol){ ~~~~~~~~~^~~~ main.cpp:17:13: warning: unused variable 'minn' [-Wunused-variable] int n,i,minn=2000000000,sol=0,nr; ^~~~ main.cpp:15:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] { freopen("lumanari.in","r",stdin); ^ main.cpp:16:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("lumanari.out", "w",stdout); ^ main.cpp:18:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ main.cpp:20:27: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &v[i]); ^