Compilare: user.cpp: In function ‘int main()’: user.cpp:39:5: warning: unused variable ‘ans’ [-Wunused-variable] ans, s, m, subsub, i, j, x, y, newSet, indepSet; ^ user.cpp:39:10: warning: unused variable ‘s’ [-Wunused-variable] ans, s, m, subsub, i, j, x, y, newSet, indepSet; ^ user.cpp:39:16: warning: unused variable ‘subsub’ [-Wunused-variable] ans, s, m, subsub, i, j, x, y, newSet, indepSet; ^ user.cpp:39:36: warning: unused variable ‘newSet’ [-Wunused-variable] ans, s, m, subsub, i, j, x, y, newSet, indepSet; ^ user.cpp:36:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("colorare.in", "r", stdin); ^ user.cpp:37:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("colorare.out", "w", stdout); ^ user.cpp:42:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ user.cpp:44:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^