Compilare: main.cpp: In function 'int main()': main.cpp:28:24: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &n); ^ main.cpp: In function 'int solve()': main.cpp:11:15: warning: 'c' may be used uninitialized in this function [-Wmaybe-uninitialized] int i, j, c, d, ans=0; ^