Compilare: main.cpp: In function 'int main()': main.cpp:63:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < v.size()-1 ; i++) ~~^~~~~~~~~~~~ main.cpp:64:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = i+1 ; j < v.size() ; j++) ~~^~~~~~~~~~ main.cpp:86:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k = j+1 ; k < v.size() ; k++) ~~^~~~~~~~~~ main.cpp:67:17: warning: variable 'pos1' set but not used [-Wunused-but-set-variable] int pos1,pos2; ^~~~ main.cpp:67:22: warning: variable 'pos2' set but not used [-Wunused-but-set-variable] int pos1,pos2; ^~~~ main.cpp:53:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("popandai2.in","r",stdin); ^ main.cpp:54:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("popandai2.out","w",stdout); ^ main.cpp:56:19: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ main.cpp:59:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&a,&b); ^