Compilare: user.cpp: In function ‘int main()’: user.cpp:42:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 1; j < lf[i].size(); j++) lf[i][j] += lf[i][j - 1]; ^ user.cpp:43:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 1; j < rh[i].size(); j++) rh[i][j] += rh[i][j - 1]; ^ user.cpp:25:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("triunghi3.in","r",stdin); ^ user.cpp:26:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("triunghi3.out","w",stdout); ^ user.cpp:28:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:31:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &x); ^