Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:43:13: warning: unused variable ‘F’ [-Wunused-variable] int F = it->first; ^ user.cpp: In function ‘int main()’: user.cpp:72:24: warning: unused variable ‘cnt’ [-Wunused-variable] long long Sol = 0, cnt = 0; ^ user.cpp:63:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("aparare.in", "r", stdin); ^ user.cpp:64:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("aparare.out", "w", stdout); ^ user.cpp:65:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ user.cpp:67:51: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &a[i].x, &a[i].y, &a[i].c); ^