Compilare: main.cpp: In function 'void caz1()': main.cpp:32:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i + 1 < tip[k].size() ; i += 2){ ~~~~~~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:93:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < tip[3].size() ; i += 3){ ~~^~~~~~~~~~~~~~~ main.cpp:95:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i + 1 < tip[3].size()) sol[tip[3][i + 1]] = s[1][tip[3][i + 1]]; ~~~~~~^~~~~~~~~~~~~~~ main.cpp:96:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i + 2 < tip[3].size()) sol[tip[3][i + 2]] = s[2][tip[3][i + 2]]; ~~~~~~^~~~~~~~~~~~~~~ main.cpp: In function 'void debug()': main.cpp:22:25: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%s", aux + 1); ^ main.cpp: In function 'int main()': main.cpp:73:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("cstring.in", "r", stdin); ^ main.cpp:74:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("cstring.out", "w", stdout); ^ main.cpp:76:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &L); ^ main.cpp:79:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%s", s[i] + 1); ^