Compilare: user.cpp: In function ‘int query(int, int)’: user.cpp:11:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < G[t1].size(); i++) ^ user.cpp:13:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < G[t2].size(); i++) ^ user.cpp:21:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(last < 1000000 && ind < v.size()){ ^ user.cpp:23:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(ind < v.size() && v[ind].first <= last + 1){ ^ user.cpp: In function ‘int main()’: user.cpp:46:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d", &n); ^ user.cpp:49:40: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d%d%d", &x, &y, &z); ^