Compilare: main.cpp: In function 'void upd(int, int, int)': main.cpp:19:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<v[i].size();j++) ~^~~~~~~~~~~~ main.cpp: In function 'bool ok(int)': main.cpp:31:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<N;i++) for(int j=0;j<tk[i].size();j++) tk[i][j]=0; ~^~~~~~~~~~~~~ main.cpp:36:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<v[i].size();j++) ~^~~~~~~~~~~~ main.cpp:51:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k=0;k<v[j].size();k++) ~^~~~~~~~~~~~ main.cpp:35:32: warning: variable 'pp' set but not used [-Wunused-but-set-variable] int mi=(1<<30),pp=0; ^~ main.cpp: In function 'int main()': main.cpp:71:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("patrate.in","r",stdin); freopen("patrate.out","w",stdout); ^ main.cpp:71:75: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("patrate.in","r",stdin); freopen("patrate.out","w",stdout); ^