Compilare: main.cpp: In function 'int main()': main.cpp:30:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 0; i < g[x].size(); i++ ) { ~~^~~~~~~~~~~~~ main.cpp:13:34: 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:15:44: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d%d%d", &a, &b, &c ); ^