Compilare: main.cpp: In function 'int main()': main.cpp:73:26: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &N); ^ main.cpp:77:37: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d %d", &u, &v); ^ main.cpp:82:35: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &key[i]); ^ main.cpp: In function 'void dfs(int, int)': main.cpp:40:49: warning: 'bestson' may be used uninitialized in this function [-Wmaybe-uninitialized] int ans = ind[bestson], cntans = cnt[bestson], val, cntval; ^ main.cpp:19:9: warning: 'pos' may be used uninitialized in this function [-Wmaybe-uninitialized] int pos, mx = 0, bestson; ^~~