Compilare: user.cpp: In function ‘int main()’: user.cpp:24:55: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < G / i + 1 && j < f[i].size(); j++) ^ user.cpp:13:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d%d", &n, &G); ^ user.cpp:16:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d%d", &x, &y); ^