Compilare: main.cpp: In function 'int main()': main.cpp:111:35: warning: format '%d' expects argument of type 'int', but argument 3 has type 'std::pair<int, int>' [-Wformat=] fprintf(g,"%d ",get_ans(i)); ^ main.cpp: In function 'bool unite(int, int)': main.cpp:54:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ main.cpp: In function 'int main()': main.cpp:70:28: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&n,&k); ^ main.cpp:75:32: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&cost[i]); ^ main.cpp:81:32: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&u,&v); ^