Compilare: main.cpp: In function 'int main()': main.cpp:35:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[x].size();i++) { ~^~~~~~~~~~~~ main.cpp:19:16: warning: unused variable 'j' [-Wunused-variable] int n, m, i, j, x, y, c, st; ^ main.cpp:19:28: warning: unused variable 'st' [-Wunused-variable] int n, m, i, j, x, y, c, st; ^~ main.cpp:22:28: 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:24:35: 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); ^