Compilare: user.cpp: In function ‘int main()’: user.cpp:34:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i <= n; ++i) ^ user.cpp:35:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 1; j <= m; ++j) ^ user.cpp:39:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i <= n; ++i) ^ user.cpp:40:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 1; j <= m; ++j) { ^ user.cpp:44:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int k = i + 1; k <= n && Moon[i][j] == Moon[k][j]; ++k) ^ user.cpp:46:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int k = j + 1; k <= m && Moon[i][j] == Moon[i][k]; ++k) ^ user.cpp:49:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int a = i + 1; a <= n; ++a) ^ user.cpp:50:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int b = j + 1; b <= m; ++b) ^ user.cpp:55:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i <= n; ++i) ^ user.cpp:56:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 1; j <= m; ++j) ^ user.cpp:57:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int a = i; a <= n; ++a) ^ user.cpp:58:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int b = j; b <= m; ++b) ^ user.cpp:64:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i <= K; ++i) { ^ user.cpp:30:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("luna.in", "r", stdin); ^ user.cpp:31:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("luna.out", "w", stdout); ^ user.cpp:32:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ user.cpp:37:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]