Compilare: main.cpp: In function 'int main()': main.cpp:54:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<v[tp].size();j++) ~^~~~~~~~~~~~~ main.cpp:64:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j==v[tp].size()) break; ~^~~~~~~~~~~~~~ main.cpp:26:33: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("biperm.in","r",stdin); ^ main.cpp:27:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("biperm.out","w",stdout); ^ main.cpp:28:17: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ main.cpp:32:27: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&a[k][i]); ^