Compilare: main.cpp: In function 'int main()': main.cpp:53:11: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses] if(!seen[i]) ^ main.cpp:59:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int x = 0; x < V.size(); x++){ ~~^~~~~~~~~~ main.cpp:34:30: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d%d", &n, &m); ^ main.cpp:36:31: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d", &p[i]); ^ main.cpp:39:34: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d%d", &x, &y); ^