Compilare: user.cpp: In function ‘int main()’: user.cpp:41:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<v[0][i].size();j++) { ^ user.cpp:42:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (t+2<v[1][i].size()&&v[1][i][t+1].first<=v[0][i][j].first) ^ user.cpp:44:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (t<v[1][i].size()) ^ user.cpp:46:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (t+1<v[1][i].size()) ^ user.cpp:23:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("stalpi3.in","r",stdin); ^ user.cpp:24:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("stalpi3.out","w",stdout); ^ user.cpp:26:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&n,&d); ^ user.cpp:28:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&x,&y); ^ user.cpp:32:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&x,&y); ^