Compilare: main.cpp: In function 'int main()': main.cpp:63:25: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%d", &N); ^ main.cpp:66:34: 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:71:32: 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:35:47: warning: 'bestson' may be used uninitialized in this function [-Wmaybe-uninitialized] int ans = ind[bestson], cntans = cnt[bestson], val, cntval; ^ main.cpp:17:7: warning: 'pos' may be used uninitialized in this function [-Wmaybe-uninitialized] int pos, mx = 0, bestson; ^~~