Compilare: user.cpp: In function ‘int main()’: user.cpp:63:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=crt+1; i<sol.size(); i+=2) ^ user.cpp:66:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=crt; i<sol.size(); i+=2) ^ user.cpp:72:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=crt; i<sol.size(); i+=2) ^ user.cpp:75:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=crt+1; i<sol.size(); i+=2) ^ user.cpp:14:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("zaharel.in","r",stdin); ^ user.cpp:15:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("zaharel.out","w",stdout); ^ user.cpp:17:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:23:37: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d %c",&ii,&jj,&ch); ^