Compilare: main.cpp: In function 'int main()': main.cpp:101:11: warning: unused variable 'ok' [-Wunused-variable] int ok = 1; ^~ main.cpp:103:9: warning: unused variable 'aj' [-Wunused-variable] int aj = mars[4][0]; ^~ main.cpp:104:9: warning: unused variable 'ok' [-Wunused-variable] int ok = 0; ^~ main.cpp:109:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 1; j < lant[i].size(); ++j) { ~~^~~~~~~~~~~~~~~~ main.cpp:114:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < lant[i].size(); ++j) ~~^~~~~~~~~~~~~~~~ main.cpp:77:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("pensula.in", "r", stdin); ^ main.cpp:78:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("pensula.out", "w", stdout); ^ main.cpp:81:37: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d", &n, &m, &qr, &c); ^ main.cpp:83:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &papa[i]); ^