Compilare: main.cpp: In function 'int main()': main.cpp:80:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j<v[i].size();j++) ~^~~~~~~~~~~~ main.cpp:46:32: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d %d", &n, &m); ^ main.cpp:53:38: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d %d %d", &x, &y, &c); ^