Compilare: main.cpp: In function 'int main()': main.cpp:79:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0 ; j < v[i].size() ; j++){ ~~^~~~~~~~~~~~~ main.cpp:98:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0 ; j < v[i].size() ; j++){ ~~^~~~~~~~~~~~~ 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:20:40: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d%d",&xx,&y,&c); ^