Compilare: main.cpp: In function 'void solve()': main.cpp:88:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (k = 0 ; k < height[i].size() ; k++) { ~~^~~~~~~~~~~~~~~~~~ main.cpp: In function 'void read()': main.cpp:19:27: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n", &n) ; ^ main.cpp: In function 'int main()': main.cpp:107:43: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("piramid.in", "r", stdin) ; ^ main.cpp:108:45: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("piramid.out", "w", stdout) ; ^