Compilare: user.cpp: In function ‘int marriage(int)’: user.cpp:40:15: warning: unused variable ‘i’ [-Wunused-variable] int conf, i; ^ user.cpp: In function ‘int strict(int)’: user.cpp:58:15: warning: unused variable ‘i’ [-Wunused-variable] int conf, i; ^ user.cpp: In function ‘void dfs(int, int)’: user.cpp:72:17: warning: unused variable ‘j’ [-Wunused-variable] int col, i, j; ^ user.cpp: In function ‘int main()’: user.cpp:122:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("design.in","r",stdin); ^ user.cpp:123:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("design.out","w",stdout); ^ user.cpp:125:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &k); ^ user.cpp:132:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &p); ^ user.cpp:134:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &x); ^ user.cpp:139:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &x); ^