Compilare: main.cpp: In function 'int main()': main.cpp:47:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (ii > a.size() || jj > b.size()) continue; ~~~^~~~~~~~~~ main.cpp:47:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (ii > a.size() || jj > b.size()) continue; ~~~^~~~~~~~~~ main.cpp:62:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i > a.size() || j > b.size()) continue; ~~^~~~~~~~~~ main.cpp:62:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i > a.size() || j > b.size()) continue; ~~^~~~~~~~~~ main.cpp:63:58: warning: value computed is not used [-Wunused-value] if (dp[i][j] == dp[0][0]) (ans = ans + nr[i][j]) % mod; ~~~~~~~~~~~~~~~~~~~~~~~^~~~~