Compilare: main.cpp: In function 'int main()': main.cpp:23:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<v[1].size();i++) ~^~~~~~~~~~~~ main.cpp:45:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<v[y].size();i++){ ~^~~~~~~~~~~~ main.cpp:17:30: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d",&n,&m); ^ main.cpp:19:39: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d%d",&x,&y,&c); ^