Compilare: user.cpp: In function ‘int main()’: user.cpp:27:78: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if (!dp[i][j] || costDP < dp[i][j] || costDP == dp[i][j] && costLG > lg[i][j]) { ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~ user.cpp:9:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("rf.in", "r", stdin); ^ user.cpp:10:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("rf.out", "w", stdout); ^ user.cpp:12:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n", &n); ^ user.cpp:15:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d ", &dp[i][j]); ^