Compilare: user.cpp: In function ‘int find(int, int)’: user.cpp:12:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i < h[xw].size()) { ^ user.cpp: In function ‘void add(int, int, int&)’: user.cpp:24:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (p == h[xw].size()) { ^ user.cpp: In function ‘int main()’: user.cpp:48:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < h[i].size(); ++j) { ^ user.cpp:49:48: warning: format ‘%d’ expects argument of type ‘int’, but argument 4 has type ‘long long int’ [-Wformat=] fprintf(f, "%d %d ", h[i][j].x, h[i][j].y); ^ user.cpp:35:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &n); ^ user.cpp:38:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &m); ^ user.cpp:40:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d%d", &x, &y); ^