Compilare: user.cpp: In function ‘int main()’: user.cpp:43:53: warning: variable ‘r’ set but not used [-Wunused-but-set-variable] int n, i, j, m, k, cnt, p, last, dif, least, q, r, smin, difmin, dmax; ^ user.cpp:41:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("rascoala.in", "r", stdin); ^ user.cpp:42:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("rascoala.out", "w", stdout); ^ user.cpp:45:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d", &p, &n, &m, &k); ^ user.cpp:49:37: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &grid[i][j]); ^ user.cpp:43:32: warning: ‘last’ may be used uninitialized in this function [-Wmaybe-uninitialized] int n, i, j, m, k, cnt, p, last, dif, least, q, r, smin, difmin, dmax; ^